Will Tesla Rally Go Flat?

Shares of Tesla raced higher Monday on news that first-quarter demand for its vehicles topped expectations.

Before the opening bell, Tesla Motors (ticker: TSLA) said that sales of its Model S car exceeded February targets by 250 units, prompting a boost in its first-quarter guidance to "full profitability." Most analysts were expecting the company to report a loss. The news comes a day before a "really exciting"...